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Proxy Contract Detector & Implementation Resolver
x402
Proxy Contract Detector & Implementation Resolver is a paid API for AI agents from chain.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-29).
Detects whether a smart contract is an upgradeable proxy and resolves its implementation address by reading EIP-1967, EIP-1822, OpenZeppelin legacy, and EIP-1167 minimal-proxy slots on-chain.
Price / call$0.004
Success—
StatusUnknown
Output
Returns the detected proxy type (e.g. EIP-1967, UUPS, EIP-1167, OpenZeppelin legacy, or none), the resolved implementation contract address, and where applicable the admin address and beacon address. All data is read live from on-chain storage slots with automatic RPC endpoint fallback.
Example use cases
Auditing an unknown DeFi contract
“I'm looking at this DeFi protocol contract at 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D on Ethereum — can you tell me if it's a proxy and what the actual implementation contract is?”
Verifying UUPS upgradeability on Base
“Can you check whether the contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base is an upgradeable UUPS proxy and give me the implementation and admin addresses?”
Identifying minimal proxy clones on Arbitrum
“Is the contract at 0x912CE59144191C1204E64559FE8253a0e49E6548 on Arbitrum using the EIP-1167 minimal proxy pattern, and if so, what master contract does it point to?”
Technical details
Endpoint
POSThttps://chain.openverbs.com/v1/proxy?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically determine whether a smart contract delegates its logic to another address, particularly for auditing, security screening, or resolving the true implementation behind a proxy. It covers all major proxy standards (EIP-1967, EIP-1822/UUPS, EIP-1167 minimal proxy, and OpenZeppelin legacy) in a single call, across Ethereum, Base, Arbitrum, Optimism, and Polygon. Prefer it over manual slot reads or block explorers when you need structured, machine-readable proxy metadata in an automated workflow.
Side effects
- Invalid contract address format returns a validation error
- Contract is not a proxy — returns proxy type as null or 'none' with no implementation address
- Network error or RPC unavailability causes fallback attempts and may return a timeout error
- Unsupported chain name returns an error listing valid options
- Address is an EOA (not a contract) — returns no proxy info
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | EVM chain to query. One of: ethereum, base, arbitrum, optimism, polygon. Default "ethereum". |
| address | string | Contract address to inspect. |
Tags
x402
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